Welcome to All Music Inc's Musicdungeon, you are looking at a great piece. 
This is the Korg HB-1 Humidi-Beat Metronome and Humidity Detector.  
Monitor your instrument’s environment- announcing the Humidi-Beat, a portable metronome with a built-in thermometer and hygrometer.
Features:
- Portable, full-featured metronome provides enhanced rhythm training for every instrumentalist
- The built-in thermometer, humidity detector, and clock provide an easy way to care for the instrument by monitoring conditions inside the case during storage, moving, etc.
- Tempo can be set using traditional Pendulum Steps, Full Steps, or Tap Tempo
- Beat Mode offers from 0 to 9 Beats, plus 5 Patterns to practice any style of music
- Convenient memory backup function recalls the users favorite settings
- Battery-saving auto-power off function
This is your chance to add a good metronome/humidity detecor to your instrument's cases. 
Don't pass this by!